JPS6326387A - Production of one-side painted steel sheet - Google Patents
Production of one-side painted steel sheetInfo
- Publication number
- JPS6326387A JPS6326387A JP17032886A JP17032886A JPS6326387A JP S6326387 A JPS6326387 A JP S6326387A JP 17032886 A JP17032886 A JP 17032886A JP 17032886 A JP17032886 A JP 17032886A JP S6326387 A JPS6326387 A JP S6326387A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- zinc
- face
- coating
- treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 24
- 239000011701 zinc Substances 0.000 claims abstract description 24
- 239000003973 paint Substances 0.000 claims abstract description 16
- 238000007747 plating Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 abstract description 20
- 238000006243 chemical reaction Methods 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 11
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 abstract description 10
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 230000003647 oxidation Effects 0.000 abstract description 9
- 238000007254 oxidation reaction Methods 0.000 abstract description 9
- 238000010422 painting Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 229910001297 Zn alloy Inorganic materials 0.000 abstract description 2
- 239000007921 spray Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 235000002639 sodium chloride Nutrition 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007739 conversion coating Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Electroplating Methods And Accessories (AREA)
- Chemical Treatment Of Metals (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は片面塗装鋼板の製造方法に係り、特に非塗装面
の酸化を阻止し、化成処理性に優れた均一な片面塗装鋼
板を製造する方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for producing a single-sided coated steel plate, and in particular, to prevent oxidation of the non-coated surface and produce a uniform single-sided coated steel plate with excellent chemical conversion properties. It is about the method.
現在、北米、カナダでは冬季の道路凍結防止対策として
、岩塩散布が行われており、自動車の車体は塩水による
過酷な腐食環境にさらされており、特に自動車の車体の
下回り等の袋構造を有する塩水の溜り易い部位に対する
防食対策として、鋼板のこの面にジンクリッチ塗料を塗
布した片面塗装鋼板が使用されている。Currently, in North America and Canada, rock salt is being sprayed as a measure to prevent roads from freezing in winter, and car bodies are exposed to a harsh corrosive environment due to salt water, especially those with bag structures such as the underside of car bodies. As a corrosion prevention measure for areas where salt water tends to accumulate, a single-sided coated steel plate is used, in which this side of the steel plate is coated with a zinc-rich paint.
このような鋼板では、塗装前に亜鉛、鉄等のりん酸塩を
鋼板表面に形成させる化成処理が一般的に行われている
。Such steel sheets are generally subjected to chemical conversion treatment to form phosphates of zinc, iron, etc. on the surface of the steel sheets before painting.
この化成処理被膜は、そのアンカー効果によって塗料を
捕捉し、めっき鋼板表面と塗料との密着性を増加し、塗
装後の耐食性を向−１−シ、自動車等の耐久性の向上を
可能にしている。This chemical conversion coating captures paint with its anchor effect, increases the adhesion between the coated steel sheet surface and the paint, improves corrosion resistance after painting, and makes it possible to improve the durability of automobiles, etc. There is.
両面に亜鉛あるいは亜鉛系合金めっきを施したものにジ
ンクリッチ塗料を片面塗装する製造工程では、塗装後、
焼付乾燥する際に非塗装面が酸化され、化成処理性が著
しく阻害される。In the manufacturing process where zinc-rich paint is applied to one side of an object that has been plated with zinc or zinc-based alloy on both sides, after painting,
During baking and drying, the non-painted surface is oxidized, significantly inhibiting chemical conversion properties.
一般に片面塗装鋼板の製造工程における塗装後焼付処理
は大気中または燃焼ガス雰囲気中で行われるが、この雰
囲気中で、焼付処理する場合、焼付温度が２００℃を超
えると非塗装面の亜鉛あるいは、亜鉛系合金めっきの表
面の酸化は避けられない。Generally, the post-painting baking treatment in the manufacturing process of single-sided coated steel sheets is carried out in the air or in a combustion gas atmosphere. When baking in this atmosphere, if the baking temperature exceeds 200°C, zinc on the non-painted surface or Oxidation of the surface of zinc-based alloy plating is unavoidable.
このような非塗装面の酸化の発生を防１１−するために
は、燃焼ガス雰囲気中で焼イ・］ける場合、混合気体中
の空気比を下げることにより、還元性雰囲気にすること
は可能であるが、この場合、鋼板表面に炭素が析出する
等の表面欠陥が生し、かつ燃料の効率が低下する。従っ
てこの方法は現実的でない。また炉を外気と遮断し、雰
囲気を還元性に調整することも考えられるが、設備費が
１膨大となり、得策でない。In order to prevent the occurrence of such oxidation on non-painted surfaces, when baking in a combustion gas atmosphere, it is possible to create a reducing atmosphere by lowering the air ratio in the mixed gas. However, in this case, surface defects such as carbon precipitation occur on the surface of the steel plate, and fuel efficiency decreases. Therefore, this method is not practical. It is also conceivable to isolate the furnace from the outside air and adjust the atmosphere to be reducing, but this would increase the equipment cost and is not a good idea.
続刊処理時の酸化による非塗装面の化成処理性の劣化を
改〆ｔする方策として、塗装焼付後に非塗装面をブラシ
等により機械的に研磨し酸化膜を除去する方法が一般的
に行われているが、この場合、酸化膜の全面均−・な除
去は困難である。As a measure to correct the deterioration of chemical conversion treatment properties of non-painted surfaces due to oxidation during subsequent processing, it is generally done to remove the oxide film by mechanically polishing the non-painted surfaces with a brush or the like after baking the paint. However, in this case, it is difficult to remove the oxide film uniformly over the entire surface.
片面塗装鋼板において、非塗装面が均一な化成処理に１
を害している場合、不均一・な化成処理によって化成処
理むらが発生し、自動車等において−Ｉ＋塗装面に後１
１塗装を１７だ場合に、塗装後の外観不良、塗膜密着性
不良、耐食性の劣化等の原因となり品質１−大きな問題
となる。For single-sided coated steel sheets, uniform chemical conversion treatment on the non-coated surface is required.
If the paint is damaged, uneven chemical conversion treatment will occur due to uneven chemical conversion treatment, and -1+
If one coating is 17, it will cause poor appearance after coating, poor coating film adhesion, deterioration of corrosion resistance, etc., resulting in a major quality problem.
本発明は−１−記事情に鑑みてなされたものであり、種
々検討を重ねた結果、片面塗装鋼板の乾燥、焼料、熱処
理時の鋼板非塗装面の酸化を阻止し、以って化成処理性
の良好な非塗装面を得る方法を提供することを目的とす
る。The present invention was made in view of the circumstances described in item 1-1, and as a result of various studies, it is possible to prevent oxidation of the non-painted surface of a steel sheet during drying, baking, and heat treatment of a single-sided coated steel sheet, thereby preventing chemical conversion. The object of the present invention is to provide a method for obtaining a non-painted surface with good processability.
本発明は鋼板の両面に亜鉛めっきまたは亜鉛系合金めっ
きを施した後、一方の面に溶接可能な塗料を塗装し、他
方の面にＨ３ＢＯ３水溶液を塗布し、次いで乾燥、焼付
することを特徴とする片面塗装鋼板の製造方法である。The present invention is characterized in that after galvanizing or zinc-based alloy plating is applied to both sides of a steel plate, one side is coated with a weldable paint, the other side is coated with an H3BO3 aqueous solution, and then dried and baked. This is a method for manufacturing single-sided coated steel sheets.
本発明は塗装面にジンクリッチ塗料など溶接可能な塗料
を塗布し、これを焼付は処理する前に、非塗装面にＨ３
ＢＯＢ水溶液を塗布したのち、これを熱処理する。この
ような処理によれば、鋼板の非塗装面が酸化する場合に
、その鋼板表面に酸化被膜が形成される以前に、Ｈ２Ｂ
４０７の酸化物が形成され、これが酸素の拡散を抑制し
、鋼板表面がそれ以１−の酸化を受けるのを防ぐ作用を
なすものと考えられる。In the present invention, a weldable paint such as zinc-rich paint is applied to the painted surface, and before baking, H3 is applied to the non-painted surface.
After applying the BOB aqueous solution, it is heat-treated. According to such a treatment, when the non-painted surface of a steel plate is oxidized, H2B is removed before an oxide film is formed on the surface of the steel plate.
It is thought that 407 oxide is formed, which suppresses the diffusion of oxygen and prevents the steel sheet surface from further being oxidized by 1-.
Ｈ３ＢＯＢは３００’Ｏ以−１−テ熱処理されるとＢ２
０日の酸化被膜を形成する。しかしながら片面塗装鋼板
の製造に際して、塗料の続刊処理が行われる一般的な温
度域である３ｏｏ℃以下では、Ｈ２Ｂ４０７の酸化物を
形成する。このＨ２Ｂ。When H3BOB is heat-treated at 300'O or higher, it becomes B2.
An oxide film is formed on day 0. However, in the production of single-sided coated steel sheets, oxides of H2B407 are formed at temperatures below 300° C., which is the general temperature range in which subsequent paint treatment is performed. This H2B.
０７は次丁程の化成処理前の脱脂■二程で筒中に溶解さ
れるため、活性な亜鉛あるいは亜鉛系合金めっきの表面
性状が得られることにより以後に行われる化成処理に悪
影響を及ぼさないものと考えられる。07 is the degreasing process before the next chemical conversion treatment.Since it is dissolved into the cylinder in the second step, the surface texture of active zinc or zinc-based alloy plating is obtained, so it does not have a negative effect on the subsequent chemical conversion treatment. it is conceivable that.
本発明において、亜鉛あるいは亜鉛系合金めっき鋼板の
非塗装面の酸化を防Ｉ卜する材料として、■ 特に片面
塗装鋼板を製造するに際して、塗料の焼付処理が行われ
る一般的な温度域である３００℃以下の低温度における
酸化抑制効果が大きいこと
■ 同時に例えば片面ジンクリッチ塗装鋼板の用途の性
格１−１化成処理性を損わないものであること
が必要である。これらの要件を満たすものとして、種々
の化合物について検討した結果、Ｈ３ＢＯ３が亜鉛ある
いは亜鉛系合金めっきに対して効果が大であることが分
った。In the present invention, as a material for preventing oxidation on the non-painted surface of zinc or zinc-based alloy coated steel sheets, ■30 It must have a large oxidation inhibiting effect at low temperatures below .degree. C.; and at the same time, it must not impair the characteristics 1-1 chemical conversion treatment properties of, for example, single-sided zinc-rich coated steel sheets. As a result of examining various compounds that meet these requirements, it was found that H3BO3 is highly effective for zinc or zinc-based alloy plating.
Ｈ３ＢＯ３は塗装前または塗装後焼付処理前に塗布する
。Ｈ３Ｂｏａの塗布を非塗装面のみに限定したのは、塗
装面に塗布すると塗料との密着性を劣化させるからであ
る。H3BO3 is applied before painting or after painting and before baking. The reason why H3Boa was applied only to non-painted surfaces is because applying it to painted surfaces deteriorates the adhesion with the paint.
Ｈ３ＢＯ３の塗布量はＯ，０１ｍｇ／ｄｍ’以上であれ
ば酸化の防止効果は顕著である。１０ｍｇ／ｄｍ’を超
えると、化成処理等の後工程へのＨ３ＢＯ３の持ち込み
が多くなり、またコスト的にも高くなるので好ましくな
い。塗布効率、コスト面から考えて、特に好ましい塗布
線範囲は０．０５〜１ ｍ ｇ ／ ｄ ｒｎ’である
。If the applied amount of H3BO3 is 0.01 mg/dm' or more, the effect of preventing oxidation is significant. If it exceeds 10 mg/dm', a large amount of H3BO3 will be carried into subsequent processes such as chemical conversion treatment, and the cost will also increase, which is not preferable. In view of coating efficiency and cost, a particularly preferable coating line range is 0.05 to 1 mg/drn'.
次にＨ３ＢＯ３の鋼板表面への塗布方法について述べる
。Next, a method for applying H3BO3 to the surface of a steel plate will be described.
塗布方法に関して、必要な要件は、塗装焼付時に鋼板表
面に完全な酸化防止被膜を生成することであり、この要
件を満たす塗布方法であれば如何なる方法によっても良
いが、塗布効率および作業性の点からみて、浸漬処理、
スプレー処理あるいはロールコータによる塗布が水溶液
の塗布に適している。Regarding the application method, the necessary requirement is to generate a complete oxidation-preventing film on the surface of the steel plate during paint baking, and any application method that satisfies this requirement may be used, but there are some issues in terms of application efficiency and workability. From the perspective, immersion treatment,
Spray treatment or application using a roll coater is suitable for application of aqueous solutions.
水溶液の塗布後、焼付処理するまでに時間がかかり、錆
の発生の恐れがある場合には、乾燥することが望ましい
。しかし乾燥せずに熱処理すると、均一な被膜の生成が
容易になるので、必要がなければ乾燥しなくても良い。If it takes a long time to bake after applying the aqueous solution and there is a risk of rust, drying is desirable. However, heat treatment without drying facilitates the formation of a uniform film, so drying is not necessary unless necessary.
本発明を実施例によりさらに説明する。 The present invention will be further explained by examples.
Ｈ３ＢＯ３を水に溶解して得た水溶液に、アルカリ脱脂
処理した亜鉛あるいは亜鉛系合金めっきした試験片の片
面をビニールテープでシールしたものを、１０秒間浸漬
した後、試験片を引き１−げ、片面ビニールを剥がして
乾燥し、次いで乾燥した試験片を３５０℃に加熱した炉
中に１０分間保持し、酸化被膜の有無を調べるとともに
熱処理後の化成処理性、耐錆性を調べた。A zinc or zinc alloy plated test piece that has been treated with alkaline degreasing and sealed with vinyl tape on one side is immersed in an aqueous solution obtained by dissolving H3BO3 in water for 10 seconds, and then the test piece is pulled out. The single-sided vinyl was peeled off and dried, and then the dried test piece was held in a furnace heated to 350°C for 10 minutes to check for the presence of an oxide film and to check for chemical conversion properties and rust resistance after heat treatment.
比較のため１−配水溶液を塗布しない試験片について、
同様に酸化被膜の発生状況、化成処理性および耐錆性を
調べた。結果は第１表に示す如く、本発明例は酸化被膜
の発生が殆どなく、かつ化成処理性および耐錆性も良好
であった。これに対し、比較例は酸化被膜が生じ、化成
処理性も劣っていた。For comparison, 1-For the test piece without applying the water distribution solution,
Similarly, the occurrence of oxide film, chemical conversion treatment properties, and rust resistance were investigated. The results are shown in Table 1, and the examples of the present invention had almost no oxide film, and had good chemical conversion treatment properties and rust resistance. On the other hand, in the comparative example, an oxide film was formed and the chemical conversion treatment properties were also poor.
本発明の製造方法によれば、亜鉛あるいは亜鉛系合金め
っきの片面塗装鋼板の非塗装面に酸化被膜が発生するの
を防止する効果により、熱処理時における雰囲気を調整
することなく、表面性状の劣化を防ぐとともに、化成処
理においては、均一な化成被膜を形成させる効果を−１
−げることかできた。According to the manufacturing method of the present invention, due to the effect of preventing the formation of an oxide film on the non-coated surface of a steel sheet coated on one side with zinc or zinc-based alloy plating, deterioration of surface quality can be prevented without adjusting the atmosphere during heat treatment. In chemical conversion treatment, the effect of forming a uniform chemical conversion film is -1.
-I was able to do something.
Claims (1)
施した後、一方の面に溶接可能な塗料を塗装し、他方の
面にＨ＿３ＢＯ＿３水溶液を塗布し、次いで乾燥、焼付
することを特徴とする片面塗装鋼板の製造方法。1 Single-sided steel sheet characterized by applying zinc plating or zinc-based alloy plating to both sides of the steel plate, then applying a weldable paint to one side, applying H_3BO_3 aqueous solution to the other side, and then drying and baking. A method for producing painted steel sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17032886A JPS6326387A (en) | 1986-07-19 | 1986-07-19 | Production of one-side painted steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17032886A JPS6326387A (en) | 1986-07-19 | 1986-07-19 | Production of one-side painted steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6326387A true JPS6326387A (en) | 1988-02-03 |
Family
ID=15902912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17032886A Pending JPS6326387A (en) | 1986-07-19 | 1986-07-19 | Production of one-side painted steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6326387A (en) |
-
1986
- 1986-07-19 JP JP17032886A patent/JPS6326387A/en active Pending
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